Tao Xu, Lei Zhao, and Xiaodong Zhou. “he mpact of nvironmental olicies on ir uality mprovement and ublic ealth in eijing”. tudies in ocial cience ∓ umanities, vol. 3, no. 6, June 2024, pp. 42-48, https://www.paradigmpress.org/SSSH/article/view/1190.